CA1251124A - Procedure to bond a layer of permeable material to a base fabric made of interlaced yarns; and felts for paper machines and filter fabrics manufactured accordingly - Google Patents
Procedure to bond a layer of permeable material to a base fabric made of interlaced yarns; and felts for paper machines and filter fabrics manufactured accordinglyInfo
- Publication number
- CA1251124A CA1251124A CA000460781A CA460781A CA1251124A CA 1251124 A CA1251124 A CA 1251124A CA 000460781 A CA000460781 A CA 000460781A CA 460781 A CA460781 A CA 460781A CA 1251124 A CA1251124 A CA 1251124A
- Authority
- CA
- Canada
- Prior art keywords
- yarns
- base fabric
- fabric
- papermaker
- permeable layer
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/08—Felts
- D21F7/083—Multi-layer felts
Landscapes
- Paper (AREA)
- Laminated Bodies (AREA)
- Filtering Materials (AREA)
- Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
- Macromonomer-Based Addition Polymer (AREA)
- Nonwoven Fabrics (AREA)
Abstract
ABSTRACT
A process for producing a dewatering felt through a bonding technique is disclosed. According to the disclosed technique, selected bonding yarns are provided in the weave of a base fabric. The bonding yarns have a fusion point lower than the non-selected yarns so that at elevated temperatures they may be used to bond a permeable layer to the base fabric without damage to the mechanical and/or chemical qualities of the non-selected yarns.
A process for producing a dewatering felt through a bonding technique is disclosed. According to the disclosed technique, selected bonding yarns are provided in the weave of a base fabric. The bonding yarns have a fusion point lower than the non-selected yarns so that at elevated temperatures they may be used to bond a permeable layer to the base fabric without damage to the mechanical and/or chemical qualities of the non-selected yarns.
Description
~2S~ 24~
PROCEDURE TO BOND A LAYER OF PERMEABLE MATERIAL
TO A BASE FABRIC MA~E OF INTERLACED YARNS; AND FELTS
FOR PAPER MACHINES AND FILTER FABRICS MANUFACTURED ACCORDINGLY
BACKGROUND OF THE INVENTION
Field of the Invention The present invention refers to the production of a dewatering felt through a process of bonding a layer of permeable material on a base fabric of interlaced yarns.
Description of the Prior Art In ~he manufacture of felts for paper machines, it is a known procedure to bond a layer of permeable material, made up of fibers interlaced such as through the needling process, on a base fabric structure of woven yarns.
The p~ior art felt thus manufactured presents several disadvantages. First, its permeability is decreased because fibers have been inserted in the base fabric structure. In addition, the layer of permeable material becomes compacted and holds numerous little funnels caused by the needle penetration.
Therefore, the needles injure the base fabric which decreases the life of the felt and adds to its deformation.
Furthermore, when the base fabric is equipped with joining means lloops, spirals, etc., intended to be joined by a pintle wire for forming an endless belt) prior to the needling process, the needling damages the joining means. Additionally, the presence of fibers, from the needling process, in the joining means renders the insertion of the wire more difficult at the time of the joining process.
L;25~24~
SUMMARY OF THE INVENTION
.
The procedure, according to the invention, eliminating these disadvantages is characterized by the fact that at the time the base fabric is manufactured, provisions have been made to place on its face special yarns, the external part of. which is made of thermoplastic having a fusion point lower than that of the other yarns, said face can be heated up to cause fusion to the external part of said special yarns, and then the layer is applied on the face. According to a special development of the invention, the special yarns are core yarns or coextruded yarns which have a core portion and an e~ternal portion, the fusion temperature of the external portion is lower than that of the core portion.
Through the procedure, according to the invention, the base fabric can be selected for certain characteristics, for example, by using yarns resistant to chemical degradation; and even if their resistance is rather low, ~t is not subjected to being further decreased below an acceptable level by the needling process. For other applications, highly-resistant bases can be selected to avoid deformation when the felt rotates, or abrasion at the time of contact with the rolls, without the fear of their partial destruction through the needling process.
In the procedure, according to the invention, the special yarns provide the bonding process, and the other yarns provide the desired characteristics ~tenaciousness, resistance to chemical degradation, watertightness, etc...~.
~, ~25~
In a preferred embodiment the present invention is directed to an improved method for producing a papermaker's dewatering felt having a permeable layer and a woven papermaker's base fabric which are secured together as a single papermaker's fabric, the improved method characterized by: (a) providing in said woven base fabric selected yarns having a fusion point less than the fusion point of the remaining non-selected yarns of said woven base fabric; (b) weaving said selected yarns into said base fabric with the remaining non-selected yarns so that the selected yarns predominate the weave on at least on~ face of the woven base fabric; (c) providing a source of permeable layer material; (d) providing a heat source for elevating the temperature of said at least one face of the selected yarns to at least their fusion point; (e) providing press means positioned after said heat source and pro~imate to said source of permeable layer material;
(f) passing said base fabric beyond said heat source to elevate the temperature of the selected yarns to at least their fusion temperature; and (g) presenting said heated base fabric and said permeable layer material to said press means with said permeable layer material adjacent said at least one face, whereby said woven base fabric and said permeable layer material are united and cooled as a single fabric.
The present invention is particularly advantageous in the manufacture of felts for the paper industry because the permeable layer among other other, eliminates paper marking under pressure and also carries the water 0 extracted from the sheet in process.
-2a-~ ~L25~2~
It is also advantageou~ in the manufacture of filterfabrics where the permeable layer serves to filter a liquid or gas and to retain impurities, especially when the base fabric, which gives the mechanical characteristics, is equipped with joining means.
It must be emphasized that the invention does not require needling machines, which are relatively expensive.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described in greater detail while referring to a preferred embodiment and the attached drawings.
Figure 1 represents a base fabric and a permeable layer used in the procedure, according to the invention.
Figure 2 is a section through the line II-II of Figure 1.
Figure 3 schematically represents a device for the application of the procedure, according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
.
With reference to Figure 2, the woven base fabric 20 20comprises warp yarns 1', 2', 3', 4', 5', 6', 7', 8' and special weft yarns 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12.
On the upper fabric face 21, of base fabric 20, the weft yarns 1, 3, 4, 6, 7, 9, 10, 12 (i.e., two yarns over three) are predominate, as seen on cut view II-II (Figure 2).
25By contrast, on lower fabric face 22, of base fabric 20, the other weft yarns 2, 5, 8, 11 (i.e., one yarn over three) are placed under the warp yarns which predominate.
In the preferred embodiment, predominate weft yarns 1, 3, 4, 6, 7, 9, 10, 12 are special, bicomposition monofilaments.
`- ~25~LZ4 ~ith reference to Figure 2, yarn 6, they include a core portion 24 preferably of polyester surrounded by a shield portion 25 made of polyamide. The other warp yarns 1l, 2', 3', 4', 5', 6', 7', 8' and weft yarns 2, 5, 8, 11 are made of polyester, which will be known to those skilled in the art.
These bicomposition yarns, can be obtained through extru-sion, through weaving, or even covering by spinning. Suitable yarns are available through DuPont Company of Wilmington, Delaware, and Shakespeare Monofilament Division, 6111 Shakespeare Road, Columbia, South Carolina 29240.
By way of example, the fusion temperature of the polyester is 230C, and that of the polyamide 6 is 180C. Accordingly, the polyamide may be heated to its fusion point, in order to achieve an adhesive effect, without adverse effect upon the polyester.
The base fabric 20 can be made by various techniques, for example weaving, knitting, or spiral assembly, etc.
When the special yarns are bicomposition yarns, the core portion may be made of a monofilament or several filaments, or cut fiber filaments; the external portion around the core, which can be a shield encapsulating the core or filament surrounding the core, has a fusion point lower than that of the core portion of the special yarns and of other non-special yarns making up the base Eabric. The special yarns can also be made of a single thermoplastic material having a fusion point lower than that of the other non-special yarns.
It follows that after fusion of the external portion 25, the special yarns via the core portion 24 maintain their mechanical characteristics.
Since there are no limitations, which can be caused by the needling process, the layer 26 of permeable material is selected to meet the desired characteristics of the finished product.
_ ~ .
~z5~2~8 Layer 26 can be constituted of continguous or discontinued fibers interlaced in themselves through needling, through fusion, through impregnation with resin, etc. Layer 26 may be generally referred to as a felt layer, which will be known to those skilled in the art, both as to composition and manufacture.
Layer 26 could also be made of an extruded fiber or film, which is or has been made permeable or fluid passing, such as a foam.
Base fabric 20 can be finished at each end with seaming devices 23 (such as loops, spirals, etc.), which will be known to those skilled in the art of seaming flat fabrics.
A device for assembling the base fabric 20 and layer 26 of the invention is depicted in Figure 3, and comprises: heating lS elements 30, for example, infrared; two rolls 31, 32 the first of which has a fixed axle and where the second is applied like the first; a heated cylinder 33; take-up rolls 34, 35; as well as a tension roll or stretcher roll 36.
The permeable layer 26 is mounted or wrapped around cylinder 37. The base fabric 20 is mounted about rolls 34, 35 and 36; it passes between rolls 31, 32 and around cylinder 33.
Preferably, roller cylinder 31 is driven in a first or counter-clockwise direction and roller 32 rotates in a second or clock-wise direction. Roller 31 and 32 are spaced so as to be separated by less than the combined thickness of the base fabric 20 and the permeable layer 26.
Face 21 with the special base yarns passes under the heating elements 30, which heat it to a temperature causing the external portion 25 of the special yarns to melt (for example, 200C~.
The permeable layer 26 is applied or pressed on to base fabric 20 through the nip of rolls 31 and 32 to face 21 with the yarns softened in the melting process. At the exit of rolls 31, 25~L24 32, the layer adheres to base 21 via the previously described shield portion 25, and the assembly, 26 and base fabric 20 is passed around cylinder 33 (layer 26 passing against cylinder 33), which is heated up at a lower temperature (for example, 120C) to improve the quality of the surface or face of the resulting fabric.
As will be appreciated by those skilled in the art, precautions will have to be taken at the beginning and at the end of the operation so that the ends of the permeable layer are not out of alignment and to present the fabric in continuous alignment.
Furthermore, it will be understood that by providing the base fabric 20 with two faces 21, 22, of special yarns, it is possible to apply a layer 26 on both sides. In application of a second layer 26, the apparatus of Figure 3 may be used with appropriate adjustment to roller 31 and 32 or an additional heat source 30 may be provided along with a second source of layer 26.
~y adjustment of the apparatus of Figure 3, the second heat source 30 may be positioned opposite the first and the second source of layer 26 may be positioned within the loop of base fabric 20 opposite the first said source.
PROCEDURE TO BOND A LAYER OF PERMEABLE MATERIAL
TO A BASE FABRIC MA~E OF INTERLACED YARNS; AND FELTS
FOR PAPER MACHINES AND FILTER FABRICS MANUFACTURED ACCORDINGLY
BACKGROUND OF THE INVENTION
Field of the Invention The present invention refers to the production of a dewatering felt through a process of bonding a layer of permeable material on a base fabric of interlaced yarns.
Description of the Prior Art In ~he manufacture of felts for paper machines, it is a known procedure to bond a layer of permeable material, made up of fibers interlaced such as through the needling process, on a base fabric structure of woven yarns.
The p~ior art felt thus manufactured presents several disadvantages. First, its permeability is decreased because fibers have been inserted in the base fabric structure. In addition, the layer of permeable material becomes compacted and holds numerous little funnels caused by the needle penetration.
Therefore, the needles injure the base fabric which decreases the life of the felt and adds to its deformation.
Furthermore, when the base fabric is equipped with joining means lloops, spirals, etc., intended to be joined by a pintle wire for forming an endless belt) prior to the needling process, the needling damages the joining means. Additionally, the presence of fibers, from the needling process, in the joining means renders the insertion of the wire more difficult at the time of the joining process.
L;25~24~
SUMMARY OF THE INVENTION
.
The procedure, according to the invention, eliminating these disadvantages is characterized by the fact that at the time the base fabric is manufactured, provisions have been made to place on its face special yarns, the external part of. which is made of thermoplastic having a fusion point lower than that of the other yarns, said face can be heated up to cause fusion to the external part of said special yarns, and then the layer is applied on the face. According to a special development of the invention, the special yarns are core yarns or coextruded yarns which have a core portion and an e~ternal portion, the fusion temperature of the external portion is lower than that of the core portion.
Through the procedure, according to the invention, the base fabric can be selected for certain characteristics, for example, by using yarns resistant to chemical degradation; and even if their resistance is rather low, ~t is not subjected to being further decreased below an acceptable level by the needling process. For other applications, highly-resistant bases can be selected to avoid deformation when the felt rotates, or abrasion at the time of contact with the rolls, without the fear of their partial destruction through the needling process.
In the procedure, according to the invention, the special yarns provide the bonding process, and the other yarns provide the desired characteristics ~tenaciousness, resistance to chemical degradation, watertightness, etc...~.
~, ~25~
In a preferred embodiment the present invention is directed to an improved method for producing a papermaker's dewatering felt having a permeable layer and a woven papermaker's base fabric which are secured together as a single papermaker's fabric, the improved method characterized by: (a) providing in said woven base fabric selected yarns having a fusion point less than the fusion point of the remaining non-selected yarns of said woven base fabric; (b) weaving said selected yarns into said base fabric with the remaining non-selected yarns so that the selected yarns predominate the weave on at least on~ face of the woven base fabric; (c) providing a source of permeable layer material; (d) providing a heat source for elevating the temperature of said at least one face of the selected yarns to at least their fusion point; (e) providing press means positioned after said heat source and pro~imate to said source of permeable layer material;
(f) passing said base fabric beyond said heat source to elevate the temperature of the selected yarns to at least their fusion temperature; and (g) presenting said heated base fabric and said permeable layer material to said press means with said permeable layer material adjacent said at least one face, whereby said woven base fabric and said permeable layer material are united and cooled as a single fabric.
The present invention is particularly advantageous in the manufacture of felts for the paper industry because the permeable layer among other other, eliminates paper marking under pressure and also carries the water 0 extracted from the sheet in process.
-2a-~ ~L25~2~
It is also advantageou~ in the manufacture of filterfabrics where the permeable layer serves to filter a liquid or gas and to retain impurities, especially when the base fabric, which gives the mechanical characteristics, is equipped with joining means.
It must be emphasized that the invention does not require needling machines, which are relatively expensive.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described in greater detail while referring to a preferred embodiment and the attached drawings.
Figure 1 represents a base fabric and a permeable layer used in the procedure, according to the invention.
Figure 2 is a section through the line II-II of Figure 1.
Figure 3 schematically represents a device for the application of the procedure, according to the invention.
DESCRIPTION OF THE PREFERRED EMBODIMENT
.
With reference to Figure 2, the woven base fabric 20 20comprises warp yarns 1', 2', 3', 4', 5', 6', 7', 8' and special weft yarns 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12.
On the upper fabric face 21, of base fabric 20, the weft yarns 1, 3, 4, 6, 7, 9, 10, 12 (i.e., two yarns over three) are predominate, as seen on cut view II-II (Figure 2).
25By contrast, on lower fabric face 22, of base fabric 20, the other weft yarns 2, 5, 8, 11 (i.e., one yarn over three) are placed under the warp yarns which predominate.
In the preferred embodiment, predominate weft yarns 1, 3, 4, 6, 7, 9, 10, 12 are special, bicomposition monofilaments.
`- ~25~LZ4 ~ith reference to Figure 2, yarn 6, they include a core portion 24 preferably of polyester surrounded by a shield portion 25 made of polyamide. The other warp yarns 1l, 2', 3', 4', 5', 6', 7', 8' and weft yarns 2, 5, 8, 11 are made of polyester, which will be known to those skilled in the art.
These bicomposition yarns, can be obtained through extru-sion, through weaving, or even covering by spinning. Suitable yarns are available through DuPont Company of Wilmington, Delaware, and Shakespeare Monofilament Division, 6111 Shakespeare Road, Columbia, South Carolina 29240.
By way of example, the fusion temperature of the polyester is 230C, and that of the polyamide 6 is 180C. Accordingly, the polyamide may be heated to its fusion point, in order to achieve an adhesive effect, without adverse effect upon the polyester.
The base fabric 20 can be made by various techniques, for example weaving, knitting, or spiral assembly, etc.
When the special yarns are bicomposition yarns, the core portion may be made of a monofilament or several filaments, or cut fiber filaments; the external portion around the core, which can be a shield encapsulating the core or filament surrounding the core, has a fusion point lower than that of the core portion of the special yarns and of other non-special yarns making up the base Eabric. The special yarns can also be made of a single thermoplastic material having a fusion point lower than that of the other non-special yarns.
It follows that after fusion of the external portion 25, the special yarns via the core portion 24 maintain their mechanical characteristics.
Since there are no limitations, which can be caused by the needling process, the layer 26 of permeable material is selected to meet the desired characteristics of the finished product.
_ ~ .
~z5~2~8 Layer 26 can be constituted of continguous or discontinued fibers interlaced in themselves through needling, through fusion, through impregnation with resin, etc. Layer 26 may be generally referred to as a felt layer, which will be known to those skilled in the art, both as to composition and manufacture.
Layer 26 could also be made of an extruded fiber or film, which is or has been made permeable or fluid passing, such as a foam.
Base fabric 20 can be finished at each end with seaming devices 23 (such as loops, spirals, etc.), which will be known to those skilled in the art of seaming flat fabrics.
A device for assembling the base fabric 20 and layer 26 of the invention is depicted in Figure 3, and comprises: heating lS elements 30, for example, infrared; two rolls 31, 32 the first of which has a fixed axle and where the second is applied like the first; a heated cylinder 33; take-up rolls 34, 35; as well as a tension roll or stretcher roll 36.
The permeable layer 26 is mounted or wrapped around cylinder 37. The base fabric 20 is mounted about rolls 34, 35 and 36; it passes between rolls 31, 32 and around cylinder 33.
Preferably, roller cylinder 31 is driven in a first or counter-clockwise direction and roller 32 rotates in a second or clock-wise direction. Roller 31 and 32 are spaced so as to be separated by less than the combined thickness of the base fabric 20 and the permeable layer 26.
Face 21 with the special base yarns passes under the heating elements 30, which heat it to a temperature causing the external portion 25 of the special yarns to melt (for example, 200C~.
The permeable layer 26 is applied or pressed on to base fabric 20 through the nip of rolls 31 and 32 to face 21 with the yarns softened in the melting process. At the exit of rolls 31, 25~L24 32, the layer adheres to base 21 via the previously described shield portion 25, and the assembly, 26 and base fabric 20 is passed around cylinder 33 (layer 26 passing against cylinder 33), which is heated up at a lower temperature (for example, 120C) to improve the quality of the surface or face of the resulting fabric.
As will be appreciated by those skilled in the art, precautions will have to be taken at the beginning and at the end of the operation so that the ends of the permeable layer are not out of alignment and to present the fabric in continuous alignment.
Furthermore, it will be understood that by providing the base fabric 20 with two faces 21, 22, of special yarns, it is possible to apply a layer 26 on both sides. In application of a second layer 26, the apparatus of Figure 3 may be used with appropriate adjustment to roller 31 and 32 or an additional heat source 30 may be provided along with a second source of layer 26.
~y adjustment of the apparatus of Figure 3, the second heat source 30 may be positioned opposite the first and the second source of layer 26 may be positioned within the loop of base fabric 20 opposite the first said source.
Claims (8)
1. An improved method for producing a papermaker's dewatering felt having a permeable layer and a woven papermaker's base fabric which are secured together as a single papermaker's fabric, the improved method characterized by:
(a) providing in said woven base fabric selected yarns having a fusion point less than the fusion point of the remaining non-selected yarns of said woven base fabric;
(b) weaving said selected yarns into said base fabric with the remaining non-selected yarns so that the selected yarns predominate the weave on at least one face of the woven base fabric;
(c) providing a source of permeable layer material;
(d) providing a heat source for elevating the temperature of said at least one face of the selected yarns to at least their fusion point;
(e) providing press means positioned after said heat source and proximate to said source of permeable layer material;
(f) passing said base fabric beyond said heat source to elevate the temperature of the selected yarns to at least their fusion temperature; and (g) presenting said heated base fabric and said permeable layer material to said press means with said permeable layer material adjacent said at least one face, whereby said woven base fabric and said permeable layer material are united and cooled as a single fabric.
(a) providing in said woven base fabric selected yarns having a fusion point less than the fusion point of the remaining non-selected yarns of said woven base fabric;
(b) weaving said selected yarns into said base fabric with the remaining non-selected yarns so that the selected yarns predominate the weave on at least one face of the woven base fabric;
(c) providing a source of permeable layer material;
(d) providing a heat source for elevating the temperature of said at least one face of the selected yarns to at least their fusion point;
(e) providing press means positioned after said heat source and proximate to said source of permeable layer material;
(f) passing said base fabric beyond said heat source to elevate the temperature of the selected yarns to at least their fusion temperature; and (g) presenting said heated base fabric and said permeable layer material to said press means with said permeable layer material adjacent said at least one face, whereby said woven base fabric and said permeable layer material are united and cooled as a single fabric.
2. An improved papermaker's felt of the type comprising a permeable layer and a woven base fabric unitized into a single fabric, the improvement comprising:
the woven base fabric being of thermoplastic yarns having different melting points and woven such that the lower melting point yarns predominate the weave on at least the face of the base fabric adjacent to the permeable layer and bind the permeable layer and the base fabric together as a single fabric entirely through the adhesive effect of the lower melting point yarns.
the woven base fabric being of thermoplastic yarns having different melting points and woven such that the lower melting point yarns predominate the weave on at least the face of the base fabric adjacent to the permeable layer and bind the permeable layer and the base fabric together as a single fabric entirely through the adhesive effect of the lower melting point yarns.
3. An improved method for producing a seamed papermaker's dewatering felt of the type having a permeable layer and a base fabric which are united as a single fabric through the application of heat and pressure, the improved method characterized by:
a. providing a base fabric having a regular pattern of yarn interlacings, said interlaced yarns including selected yarns having a fusion point less than the fusion point of the remaining non-selected yarns;
b. interlacing said selected yarns with said non-selected yarns so that the selected yarns predominate the face of the base fabric on at least one surface thereof;
c. providing permeable layer material;
d. elevating the temperature of said base fabric to at least the fusion point of said selected yarns;
e. positioning said permeable layer material adjacent to and in contact with said selected yarns of said base fabric; and f. applying pressure in combination with steps d and e, whereby said base fabric and said permeable layer material are compressed together and are united and retained as a single fabric entirely through the adhesive effect of said selected yarns.
a. providing a base fabric having a regular pattern of yarn interlacings, said interlaced yarns including selected yarns having a fusion point less than the fusion point of the remaining non-selected yarns;
b. interlacing said selected yarns with said non-selected yarns so that the selected yarns predominate the face of the base fabric on at least one surface thereof;
c. providing permeable layer material;
d. elevating the temperature of said base fabric to at least the fusion point of said selected yarns;
e. positioning said permeable layer material adjacent to and in contact with said selected yarns of said base fabric; and f. applying pressure in combination with steps d and e, whereby said base fabric and said permeable layer material are compressed together and are united and retained as a single fabric entirely through the adhesive effect of said selected yarns.
4. An improved papermaker's fabric of the type having a layer of permeable material secured on a base made of woven yarns, the improvement characterized by:
the base having special face yarns, the external part thereof made of a thermoplastic having a melting temperature lower than that of the other base yarns; and the external part of said special face' yarns being fused to said layer of permeable material and securing said permeable material to said base in a unified papermaker's fabric.
the base having special face yarns, the external part thereof made of a thermoplastic having a melting temperature lower than that of the other base yarns; and the external part of said special face' yarns being fused to said layer of permeable material and securing said permeable material to said base in a unified papermaker's fabric.
5. The papermaker's fabric according to claim 4 further characterized by the fact that the base fabric has joining means for interconnecting the ends of the base fabric and rendering it endless.
6. The papermaker's fabric of claim 4 further characterized by said fabric being a papermaker's wet press felt.
7. The papermaker's fabric of claim 4 further characterized by the fact that the special face yarns have a core surrounded by the external part, the melting point of the external part being lower than that of the core.
8. The papermaker's fabric of claim 7 further characterized by the fact that the core is polyester and the external part is polyamide 6 which has a melting point of approximately 200°C.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR13481 | 1983-08-11 | ||
| FR8313213 | 1983-08-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1251124A true CA1251124A (en) | 1989-03-14 |
Family
ID=9291574
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000460781A Expired CA1251124A (en) | 1983-08-11 | 1984-08-10 | Procedure to bond a layer of permeable material to a base fabric made of interlaced yarns; and felts for paper machines and filter fabrics manufactured accordingly |
Country Status (8)
| Country | Link |
|---|---|
| EP (1) | EP0133836B1 (en) |
| JP (1) | JPS60502012A (en) |
| AT (1) | ATE30345T1 (en) |
| AU (1) | AU569912B2 (en) |
| CA (1) | CA1251124A (en) |
| DE (1) | DE3466902D1 (en) |
| FI (1) | FI86657C (en) |
| WO (1) | WO1985000840A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6462145B1 (en) | 1999-07-19 | 2002-10-08 | Paul C. Fleri | Polymer blends of trimethylene terphthalate and an elastomeric polyester |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0239207A3 (en) * | 1986-03-26 | 1989-11-08 | ASTEN GROUP INC. (a Delaware corporation) | Method of manufacturing papermaker's felt |
| US5549967A (en) * | 1995-05-04 | 1996-08-27 | Huyck Licensco, Inc. | Papermakers' press fabric with increased contact area |
| US6030908A (en) * | 1998-03-16 | 2000-02-29 | Jwi Ltd. | Multilayer porous fabric |
| DE19859583A1 (en) * | 1998-12-22 | 2000-06-29 | Voith Fabrics Heidenheim Gmbh | Paper machine wire for the wet end of a paper machine |
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|---|---|---|---|---|
| GB276392A (en) * | 1926-04-07 | 1927-09-01 | Respro Inc | Leather substitute and process of making the same |
| FR1318984A (en) * | 1962-03-31 | 1963-02-22 | Us Rubber Co | Sewing braid improvements for rugs |
| GB994914A (en) * | 1962-10-11 | 1965-06-10 | Dynamit Nobel Ag | Composite plastics article |
| GB994917A (en) * | 1962-10-26 | 1965-06-10 | John Halliday And Sons Ltd | Improvements in or relating to apparatus for detecting variations in the thickness of a moving filament, thread or the like |
| DE1635487A1 (en) * | 1967-10-25 | 1971-10-28 | Degussa | Composite webs |
| GB1236780A (en) * | 1967-11-06 | 1971-06-23 | Huyck Corp | Improvements in papermaking apparatus |
| GB1349644A (en) * | 1970-06-03 | 1974-04-10 | Cpc United Kingdom Ltd | Method of joining web material |
| JPS5930819B2 (en) * | 1976-04-08 | 1984-07-28 | 株式会社クラレ | self-adhesive interlining |
| DE2844397A1 (en) * | 1978-10-12 | 1980-04-30 | Basf Ag | COMPOSITE LAYERS FROM FILLED POLYOLEFINS AND A THERMOPLASTIC DECORATIVE LAYER, AND THEIR PRODUCTION AND USE |
| GB2067133A (en) * | 1980-01-12 | 1981-07-22 | British Vita Co Ltd | Improvements in or relating to non-woven fabrics |
-
1984
- 1984-08-10 WO PCT/FR1984/000187 patent/WO1985000840A1/en active IP Right Grant
- 1984-08-10 AU AU33123/84A patent/AU569912B2/en not_active Ceased
- 1984-08-10 DE DE8484401659T patent/DE3466902D1/en not_active Expired
- 1984-08-10 AT AT84401659T patent/ATE30345T1/en not_active IP Right Cessation
- 1984-08-10 JP JP59503082A patent/JPS60502012A/en active Granted
- 1984-08-10 CA CA000460781A patent/CA1251124A/en not_active Expired
- 1984-08-10 EP EP84401659A patent/EP0133836B1/en not_active Expired
-
1985
- 1985-03-29 FI FI851290A patent/FI86657C/en not_active IP Right Cessation
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6462145B1 (en) | 1999-07-19 | 2002-10-08 | Paul C. Fleri | Polymer blends of trimethylene terphthalate and an elastomeric polyester |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0133836A1 (en) | 1985-03-06 |
| FI86657B (en) | 1992-06-15 |
| WO1985000840A1 (en) | 1985-02-28 |
| EP0133836B1 (en) | 1987-10-21 |
| JPS6344877B2 (en) | 1988-09-07 |
| DE3466902D1 (en) | 1987-11-26 |
| FI851290L (en) | 1985-03-29 |
| AU569912B2 (en) | 1988-02-25 |
| ATE30345T1 (en) | 1987-11-15 |
| AU3312384A (en) | 1985-03-12 |
| FI851290A0 (en) | 1985-03-29 |
| JPS60502012A (en) | 1985-11-21 |
| FI86657C (en) | 1992-09-25 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |